How are radioactive elements different from stable elements? What will be an ideal response?
Radioactive elements spontaneously decay to other more stable isotopes, releasing energy in the
process.
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____________ provides educational and clinical services to help couples choose how many children to have and when to have them.
Fill in the blank(s) with the appropriate word(s).
How is a pothole formed?
A. Through deposition of sand on the inside curve of a meander B. By the saltation of individual sand grains on a muddy stream bed C. Because of the chemical weathering of rocky banks by acidic river water D. Through the swirling, scouring action of pebbles on a hard stream bed E. Through erosion of a muddy bank on the outside curve of a meander
In which of the following states has a tornado never occurred?
a. Alaska b. Hawaii c. Maine d. North Dakota e. tornadoes have occurred in every state
In which of the following region would you expect to have the highest levels of seawater salinity?
A) Polar oceans B) Midlatitude oceans C) Subtropical oceans D) Equatorial oceans